Is it normal to want to kill someone ???

So I was wondering if it's normal to want to kill ? I have had these thoughts for about 4 months and I just have the urge to kill. It's not just when I'm angry either (although that just makes the urge worse), I think about it all the time and it's always in the back of my mind no matter what emotion I'm feeling.

I never feel any empathy for humans weather it's a stranger, family or a friend, although sometimes I pretend I feel sorry for them but in my mind I couldn't care less. However I feel a bit of empathy for animals . I would never kill an animal - unless it's a bug because I kill them all the time, as far as my memory will remember- but I wouldn't think twice about killing a human

I like blood and gruesome stuff and I enjoy seeing people in pain. And at night and during classes I always plot ways to kill people (people I know, people at school as well as my family) and it amuses me to think about this which makes me uncontrollably laugh and I just start to laugh randomly in class because of it. I also have dreams about killing people and they always make me feel happy and relieved in the morning. I have told 2 of my friends about this and they said that I'm a psychopath and that they could imagine me doing this , and ever science I told them this they have been more distant from me, are they scared of me?( I didn't tell them that I thought about killing them though)

I am wondering if this is normal to think like this? Am I a bit psychopathic?? A there anyone else out there who thinks like this???